Bite Registration and Alginate Flashcards
what are the components of alginate
potassium alginate calcium sulfate trisodium phosphate diatomaceous earth zinc oxide potassium titanium fluoride
calcium sulfate reacts with the potassium alginate in order to form ___
gel phase (solid)
diatomaceous earth and zinc oxide add what to alginate
the bulk of the material
sol phase is when material is in a ___ state
liquid
loss of moisture is aka
synersis
ambibtion is known as
absorption of water by material
normal set has a working time of ___ and setting time of ___
working - 2 mins
Setting - 4.5 min
fast set has a working and setting time of what
working - 1.25 min
setting - 1-2 mins
working time is for
mixing the material and loading
setting time is when a ___ occurs
chemical reaction occurs changing the state of the material to solid
what temp should water be when mixing alginate
70 F or 21C
what is hysteresis
the change in temperature that causes reversible hydro colloid material to change states
what are the 3 curing stages
initial set - working time
final set - setting in the mouth
final cure - 1-24 hrs after removal
what is a bite/occlusal registration used for
obtaining the centric relationship of the archea
3 types of bite registrations
wax bite
polysiloxane putty
ZOE paste
what is border moulding
a closed adaptation of impression edges to the muccobuccal fold
preliminary impressions are done with what material
alginate
what material is used for gina impressions
elastomeric materials
where do you stand when placing a mandibular impression tray
infront of the patient
where do you stand to place a maxillary tray
slightly to the side
what is utility or beading wax used for
extending the length and height of the trays
why are perforated trays used
to enhance the mechanical lock or seal of the impression
what is the clinical procedure of impressions
assemble materials and equipment
prepare the patient
select and prep trays
take mandibular the maxillary impression
